C#使用OpenCv图像批处理并改变图片大小并且重命名

添加NuGet包

选择最新版就好了

安装完成后右键项目重新生成方案

使用OpenCvSharp.CPlusPlus命名空间

using OpenCvSharp.CPlusPlus;

写一个函数用来改变图片大小并且重新命名

read_path是存储图片的文件夹的路径，write_path是改变后图片存储的文件夹路径，filename是图片重命名，width和height分别为图片修改后的宽和高

public static void ResizeImg(String read_path,String write_path,String filename,double width,double height) {

Mat img1 = new Mat(read_path);
     Mat img2 = img1;

OpenCvSharp.CPlusPlus.Size size = new OpenCvSharp.CPlusPlus.Size(width, height);
     Cv2.Resize(img1, img2, size, 0, 0);
     Cv2.ImWrite(write_path+"\\"+ filename, img2);
   }

在Main函数中使用该函数

static void Main(string[] args)
   {
     string dir_path = @"G:\TestImg";//读取路径
     String write_path = "G:\\TestImg2";//存储路径
     String[] filenames=Directory.GetFiles(dir_path);
     for (int i = 0; i < filenames.Length; i++) {
       ResizeImg(filenames[i], write_path, i + ".png", 200, 300);
     }
     Console.ReadKey();
   }

运行结果

完整代码

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using OpenCvSharp;
using OpenCvSharp.CPlusPlus;
using System.Runtime.InteropServices;
using System.IO;

namespace ResizeTest
{
 class Program
 {
   static void Main(string[] args)
   {
     string dir_path = @"G:\TestImg";//读取路径
     String write_path = "G:\\TestImg2";//存储路径
     String[] filenames=Directory.GetFiles(dir_path);
     for (int i = 0; i < filenames.Length; i++) {
       ResizeImg(filenames[i], write_path, i + ".png", 200, 300);
     }
     Console.ReadKey();
   }

public static void ResizeImg(String read_path,String write_path,String filename,double width,double height) {

Mat img1 = new Mat(read_path);
     Mat img2 = img1;

OpenCvSharp.CPlusPlus.Size size = new OpenCvSharp.CPlusPlus.Size(width, height);
     Cv2.Resize(img1, img2, size, 0, 0);
     Cv2.ImWrite(write_path+"\\"+ filename, img2);
   }
 }

}

来源：https://blog.csdn.net/weixin_43356091/article/details/104174341